Electrons

Question 1

Thermionic emission

Answer 1

When a metal is heqted to give electrons enough energy to escape

Question 2

Mass of an electron

Answer 2

9.1x10^31kg

Question 3

Energy of an electron

Answer 3

1.6x10^19

Question 4

How do you accelerate an electron

Answer 4

• connect a cathode and an anode to a cell at 5000v
• connect a heating device behind the cathode
• find the speed of an electron using the equation, E = voltage/distance
• if an electron goes through 5000 volts, the energy is 5000 electrons for example
• we use the electric field to accelerate the electron

Question 5

how do you find the wavelength using De Broglie’s experiment

Answer 5

• use the voltage and multiply the coulombs by the voltage
• use P = mv and multiply the mass by the voltage to find the final momentum
• use de Broglie’s equation (wavelength = h/p) to find the wavelength